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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6ce761c2b189f27b3841eefd48d3b9a44b42c572f97ce0f11ffd27504c5f7e' 
  AND token = 'T+YjLdpx7XfDQUr0dqvFPwg5U97NcNELrSlLOClVOSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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