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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b34b541fb924f2a1883e0963acb76bf527c54ee46a7dc4218cb8a871dd76a4d' 
  AND token = 'XU4HZ9ToVF6Ctd/Nxyv4pLtHANnDl/ObvuYGHEVqVv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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