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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2cbcdf4932911758aa9e06ec23124f7c18d6fbcfa57f3b62317be1551b8b1e' 
  AND token = '0tTncclbmkPQ0goW7G8yzsigJjEVGftBwDTepgJPyU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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