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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e0e7d1ae6be1d9295a29c1b74f19c764e92ef936234803f0d9c9249150c825' 
  AND token = 'QhGI0RaXx7+IQlIJwBqVVmqb5GND2vx5ie+FEcaymag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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