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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a752323bc025f3250a60ac8d00da3320378139a93eaa6b71c7c91f65957563' 
  AND token = 'iheujPNHQgCiRNT1MwkWIPIBlJh6G5P8c60CrPtac34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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