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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed0bc078139d0f7642050820fdfb29a76c6aa9597f17596e344aac866f0d754' 
  AND token = '13DcXDfVu7VpWqlKRS5i42fQnxwCKofzs3NiWHtC6wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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