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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b063674691a997409a6cff9539c7bcab809f237a106c697f5cdbc0c1cb4dda0b' 
  AND token = 'wtGlLh24SmPionzkHsgJG/rj2fFFMTKLnqsKe47ni6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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