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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ecdd409ef68c97bd713e8b2e7afad7996f2ea4aab4f22250b530e3f60856af' 
  AND token = '2ObUeAdNYGFgV2mvidRz6kpJCz9q+eUcI9KLLzqI8cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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