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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a914bf03fa09cb54a4f186e26e3d17e57da6cc1a6fe9e6f6063fcd8cdabce3d5' 
  AND token = '7CAayxnYMvmx9NdchLSOytFThjKScOUflPcZ7Mxr5iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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