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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ce28ae2d3e46556afb3103b117f5f912bb3162de7d5654ffa769c3d3d4e2cc' 
  AND token = '2lO65cmfrDPWqkSXnwX1+qS/o/HWL7fuD+x5GWv6Bvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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