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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fd9b11a6b9977b8b0e818be3aa73f87775cc351e407f84fbe6ee369391cfbf' 
  AND token = '7iwG6Dwvu7JJjv2XIIrFa8jzFEBC2R9+IBQQ9mJTJl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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