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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b03ed01dee21676a9dbf85d7c8e9db476d968b71c98bf234c8ee8b070ceea5' 
  AND token = 'i1+DhJothFzd+iSMm7/gji1htnBpS2uvZ6i2EuHMbIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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