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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba712992bab3062cbaf3ab83d929b85c472e58f7ad51d59cc1e328093fc2bf89' 
  AND token = 'jn/k8X275ib6VVzkWeC/TZtdZImGbcAA1HJxIx+isww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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