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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6231a0a07cc6e55d67484e9e1e275ef264e59e2dcda90854fd8809887f1fe1f0' 
  AND token = 'AWD1kWpX6KxANjOQhspQRIAV64l6l+vrrS+5kyyWDnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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