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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b113cd9ff84d4f28aa0859486a0ce813dca13eeda092fceb89643ae101a2fa' 
  AND token = 'W4MWZU3oQ6di0/MKMFyHxaJQOIFtayfyk5t6WCnSYjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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