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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e613ae06d473fc437a71f26fb4efc57d5293e39651c44f9b141f655df3bb7fb' 
  AND token = '/WBriXhXhpixhnZT3rJ8BVJWXPpG27QHaudA5Pv4iXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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