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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bae9711ee44ce7e16c76dd8a4156d918cb4eb93a529ff91f4dcbeafa7fba43d' 
  AND token = 'XJseEVmV2wgYzbC8fbuPCGsL5HtgVBxPqtVZMgmQTto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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