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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48c2ca5104ab1bafa3c31bc15dc128274d6e4f608be75f4713de932616d85f2' 
  AND token = 'c4GpbbQBrkB3CVNUl/amfbvA1xc0irOCzdAljMVOM4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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