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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f4d6387e03a8dad0a9418a6616ea44e99f3200e6f86e2c434ab3ebcfdb5a00' 
  AND token = 'mfwlKpB/7hj6WMPZHXOvM5RyeF1L1492okMnODKN8uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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