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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f867df71d176f2ac3bd9f684f0c1bb68b7efe1ae464d936d11665cc74686c11' 
  AND token = 'LS08Xk8czcgqQDDpd3jEGjip3+kG6XBeIMAqYkEFOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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