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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3a75495d6c3aea6b162f3e39c3cf1cb86449dbcd677a00916092790727e9e2' 
  AND token = 'CMCA8ISPvsbRYJGwb4qZuCNXeksvwqhYWTmeO4kxeTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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