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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300f3a6f242c92d94edc9f2480ee3a05a00161b7b5bb34a742cd149589261659' 
  AND token = '4J4BUJbp13aHovslBL1T7EacP4zsQUKJYRBodtCFq+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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