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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cc7e29db6bbc048e077fdd471c954a468cd05f9a9bc957b60f8d0948c19cd3' 
  AND token = '5/iLlGB19zVA46BTSwQfYa7+VQtv9znPbSAPrPEQ7N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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