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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f5c14cf7a775689dafad9b6e193617eca460c5e055e812e6f9ec0f1d0deaa8' 
  AND token = '3GR/V9g2gWcLQ/1qAC/wf+hl7Py48YmH225CuB63Vpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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