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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60aa4cb4567d3406904919f91f90f07af4658892eae56e0996ede4d3ad28bf09' 
  AND token = 'A8kWmTysp+VYNQUst1yPIhC2WrifFVdoHv/jp4OGHnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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