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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308b0edbd10d592452deb4d87f7e68d0d9df546dd661ed95fe33b3246a8af672' 
  AND token = 'O1JKe1NWUvnQso/hXysNV6xv7IaqYKXNoncY5EseFZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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