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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96d9ad3506532f5c125465aa4b2fa840f2aaec3520a1418843c72d1fba0637d' 
  AND token = '5F5/b1x1fdqs7M2V2RMYqHtP4/qIDZS9qezSTISrMbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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