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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c441ef0c3f1096ff10730f555783c9a5a3af6ff552134e9494a2325ccce63e' 
  AND token = 'zf5R4MDw8yc4i/GHt6UFzzK209T739hnVpmITQvlNrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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