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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c4ad6a61ee2fb9b990d18e789dd13397adaff0a81e6c0547a99b90dccc56be' 
  AND token = '4hqWhq+ZUCjbMOYNx7b63Lc2xW69Imx2wYFHYCjWbUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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