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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc37351d12f55b31d6ffcb9df5a78d3b96117b4dd903dad3684c4fa19274cc7' 
  AND token = 'DUFPyLnziAa/Rvlm9/MwS/FYcBidH2G7HucoQU9avv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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