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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69666fe2fcc745adcdd401e169d3622d81cbb86e9019f26959717f2d4fed3797' 
  AND token = 'FruZbR4ZGegmF2sYEYoaDFZ6HtB33L90Cf3tbOHDwus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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