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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bdcf9a29cb3e918f583c89873b53d8d06739609648158145dff4616295d91f' 
  AND token = 'egAilAS99QFCxINhSv0dByAEhQYtKU4O+3Qf9piI3EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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