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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c69edc2e1ca465b5fa891cf68ef6075482b6b69209821f04189c4ccd1da310' 
  AND token = 'Nj0cWwCSEULVi0qZeiVAwxF3+z5j6Qpcmkim7H8MF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}