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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc2d7967215d8d8bcc4c6610c7712a1865555048843572e163db5f303b0d839' 
  AND token = 'HQQGCr6hnBA5JuNKBJJPL5tX2x/eHQ51HrO7nahhNR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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