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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce0c20862e4b9f02ef976090c708fe2e4414468e0d188177b76e994c6002c60' 
  AND token = 'gFopAlg3exBGKEAuOhJt3fYJ/6FOPbOLz0mrMvvm/8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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