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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa86f7e3bbf9d40c6ce713de9af1f43bc342e5dafe5c795e7ee9a5d1521b80f' 
  AND token = '0RbpxGTjM2z6ngW/SnpSa2qm1BIK9IfPyxkHiGp1UZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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