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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81834f8bfca8ce070de308c1796cf7db82eda6b3554c15fe38ed8bae99359a6a' 
  AND token = 'NYVjsuuDjeLCvC6ttbzG2Mflco5FtCQdb+i0W7urQQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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