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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3401b3c7155d613303ce28e09c31360c2a297d9e1c0721f703f9ce76a59c4265' 
  AND token = '/y7l7xLhZnLyzRIwq99+p24sfu332Up08J+2iwu1hiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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