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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a64b7674f7c69efb587487aff6c977158bb947c17abea643279d6fde4690b5' 
  AND token = 'jxqOaXPD6VR260oOiYVC93RqvAU3KUttM3WyUiIoWxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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