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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478e1c14dd1d08cc7d8875bb20be034a622d75ea995189dd164ef573694421a2' 
  AND token = 'tuPrKNDwHWamzV2N+QaWp474XMtQYArd2yGNdylCWcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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