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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3188dd6d120ee9ff8205a5ca5eaddb7a4c7798dcf606bfc64857f5c8dbebbc' 
  AND token = 'aK+3l1RBatnuCVXhadtzCfKfQBS7uCMdMURdR8lj11U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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