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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d4c282e8adb502d23f4de5fd81b2a62f1d33680dfebd318890ee83e415bdf1' 
  AND token = 'dURqU5i7t3jzA/P+JumhkHiygaT/QFR5tBwoqdAYjRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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