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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5071dcf8e733e527d961f240384ad2669b69dd8742846197daed3f4b5b8bf0aa' 
  AND token = '/n4NrgtScYRIID4Cy+TErZbEAyhDiKqsdOwGkEADj6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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