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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37faec13ea0292e203b5e191ca7108c6c628bc1e7bdf670e7e9af58cabfa6449' 
  AND token = 'y/uNyfLK9EUwX/EU/QV663PGh4s3kIZPlMxetOXnSaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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