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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f828fbca10c840e3f7be586f9c35d19eb9ffa3a31cdce634658213f9338c5270' 
  AND token = 'q4ka2IHcARSabgH9Yh9dsJ1AP3TAtmd37tfD45P0eKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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