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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd68fe5ac5c2c90b53f7f42b0c7ef1fd4a8060f306b15a654ddda07f67b89be' 
  AND token = 'Pug69SBXCRVwBUV03Pc35M+zpgE6OPq68LGV6joKn5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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