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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6bf86f73ae54012704044e7f1b3bcd92e658e73098d1ec25a126f621ab99c1' 
  AND token = 'JR50adk6QjzTGEImJLOSdRyi2vbZ5VC8i3XUVQcuXxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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