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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d88a31eb81872ce270a480322f8ef3806c5f2d59e7462ed8c9d712200a9c47' 
  AND token = '8rw0VBpTkIOBNjLnGAHgLcIyLxyV6/2MVMOu0k+WF5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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