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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4ae7132c1f66d6d51267b3d05acc16869e25bcd170f983bf978f38cd92dc7c' 
  AND token = 'UWhzXQ709Hpj8H1fiBVcVcUeZf5w94yK9NV6LXoi+ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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