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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3067ac2a9a18bc72d84ef781ca5a25e5ad31a1e2bcd7711912d1c2d5959ee8' 
  AND token = 'KEWe6a7Nkd7Umdv9r3X0oItyy2pANG5ki9L52caJaMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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