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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa77bb67cc42a23f5e4dac07e6ac4265cbde2d04c5f7393410bff5ad92a3c1b' 
  AND token = 'mXHTd+L3tqf0+EKm6xt+vjuoDKwH00SPydtkO5J1/wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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