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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038245aa4120b4f91039e9feae95a35b71babffc3f26ee112e0e59250093a028' 
  AND token = 'ncXP2gYl4O6MO+LSwAGGI65Jhz+GGDGNwRNxQ57teqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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