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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d8a4b4942e521c96b0e8bcca2dbec701673ca0504731bf5099ca4c1787d5c3' 
  AND token = '40Z3H/KLDxRfo/mBnPo4nBKxgTUr2atuGNmTenO5OnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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