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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2716d979f0028a4f252a24e195f59f066d4b892fe0c0809378b1c0f537db8e' 
  AND token = 'MNxs8i0AmgptDu/Dp0U9JJnxucdeGu0LSLtoxZg2kOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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