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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31201a29c5f59bef45eeb3eefdca10ec2578ab542efbb5347a182a0c6faf1668' 
  AND token = 'oGI2CjdJw37aG9ua9FFnA6I+XBp1WRJlGB60kXR/Ic4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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