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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7714cbd1658d4a4a665ebf6a5975d3558d8564fde8b659e88b2f2be97dbd24' 
  AND token = '3Qh05PA85CjS0C0Iczw6fj1u9T8GQKvvtrrqYUFv3Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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