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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64297bf307e9626b5186cba341b9d152a854f7fd341a83dd6be91a32ec9d008' 
  AND token = 'ux4m6uE5bKsJkLYSBpIDE7LFOI6UQJ/2/mBIhs7Oiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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