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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb617729c78fb9183e92913c3827a6922bb4fd69f0ab830c3860e17170bb6b9' 
  AND token = 'yxKiZN8DEQ6Vrwt2REEdu5zkt0+fqbp1E2FAV6VWKb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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