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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a9fa85c40bf108deddd00ad70d084c79dad7da92cfa5312646b8a537e6ae18' 
  AND token = 'AMUGZN3FTgP/Ry63+kJJEzrkOTUBHdqe8sbsXlM9ZEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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