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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33cf3bc38a0fc9b5bd7b5c1609d0bcad10d42730b9d88200db9db23310cba6f' 
  AND token = '56w8fqmHJG/3u/e/fn8tVLp+t9ZKW44cBT6IlqNEGyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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