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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5023767cc4c2f7c6ce62b8e0b45f234b11c4e4a7f56739a9d0a7bbfb4dec9d4b' 
  AND token = 'erXa6SAAAbvKZh+ethM3Nm1m1rRFUkASJisryra4KTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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