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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2365685861b9971b07b498d84cac3d41a3a895ea8d2e5692037805325c15dc5' 
  AND token = 'ETPAcKsF/wbQ4rr6rVsPDaTUXIBiW+6zaEGvna4r2Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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