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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9942c4100d005ec8d016764ad8e6c87c6a8687c16d3b3c5ddfdf50cca72e4c96' 
  AND token = '1IV0INziACDt8Wv52sexTjiMS4+nAT0rILm1x+mN7Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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