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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4f6361ad30cc93b0e223936281830ced46cd994ed4de77ee1f2b4ebed09a40' 
  AND token = 'MT/Gsfj65aDiEzekKCdPoagDcOC+a1cRzAiAiss6rnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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