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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c47dfef6926ec797599e1990b188012a4d3e3e69acd8d9c8356ccf6d714723' 
  AND token = '4P6/1bgkKX18d672sSn2qM1/OtZkw/58lF3KqF5n3R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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