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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd53f615c5c18cf17761277e8bc0fc1e475de2e0efeffa2bc61f7aa00a5197c' 
  AND token = 'HsQhClN7qiURX3qqzsJI8dDS54hsq9iKihPukP3/ioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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