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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e154913ce6e16e93af46b4092fa62d6cf08cb9794baa877970d4f903ca817883' 
  AND token = 'kGBhehr3NSxeQIEOIJOmJ2/1XNDCVzIXCV9O/4SFsfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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