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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c372dc6aeafe0bdf6178cf6080417236099f60ecd214dd5451d623dc5a4a40' 
  AND token = 'hggLjEC9tpk81uQ98sB7EGBU1T0bmoEbRj6WOPM+ym4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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