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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8208b6e44acf21a8955e2d89f494028c9d8bd50b906f25e92cfe18c2d9eafa96' 
  AND token = 'zUmKwMyDUIV/OPQriCg/ejrqFU4UOwLfR4vaI9bMpJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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