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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a470b8aa99822e91c83f796bab7acd3a42eb3ea36b3e4f180ba51cda32ab3f' 
  AND token = 'qI9rgDKV/IszZSW/OLo0I/qK0WPegkj92ApPlcgXwrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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