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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096232f864012fc7b8b3cc766f2fff4f73171fbbea9c4b19db52e1dcc2f8daf9' 
  AND token = 'uePEs3kMtvyuDG1/rgCT7YHX5KTP+Hw1s5MARj1zGc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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